prclist.h

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- *//* ***** BEGIN LICENSE BLOCK ***** * Version: MPL 1.1/GPL 2.0/LGPL 2.1 * * The contents of this file are subject to the Mozilla Public License Version * 1.1 (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is the Netscape Portable Runtime (NSPR). * * The Initial Developer of the Original Code is * Netscape Communications Corporation. * Portions created by the Initial Developer are Copyright (C) 1998-2000 * the Initial Developer. All Rights Reserved. * * Contributor(s): * * Alternatively, the contents of this file may be used under the terms of * either the GNU General Public License Version 2 or later (the "GPL"), or * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), * in which case the provisions of the GPL or the LGPL are applicable instead * of those above. If you wish to allow use of your version of this file only * under the terms of either the GPL or the LGPL, and not to allow others to * use your version of this file under the terms of the MPL, indicate your * decision by deleting the provisions above and replace them with the notice * and other provisions required by the GPL or the LGPL. If you do not delete * the provisions above, a recipient may use your version of this file under * the terms of any one of the MPL, the GPL or the LGPL. * * ***** END LICENSE BLOCK ***** */#ifndef prclist_h___#define prclist_h___#include "prtypes.h"typedefstruct PRCListStr PRCList;
/*** Circular linked list*/struct PRCListStr {
PRCList *next;
PRCList *prev;
};
/*** Insert element "_e" into the list, before "_l".*/#define PR_INSERT_BEFORE(_e,_l) \ PR_BEGIN_MACRO \ (_e)->next = (_l); \ (_e)->prev = (_l)->prev; \ (_l)->prev->next = (_e); \ (_l)->prev = (_e); \ PR_END_MACRO/*** Insert element "_e" into the list, after "_l".*/#define PR_INSERT_AFTER(_e,_l) \ PR_BEGIN_MACRO \ (_e)->next = (_l)->next; \ (_e)->prev = (_l); \ (_l)->next->prev = (_e); \ (_l)->next = (_e); \ PR_END_MACRO/*** Return the element following element "_e"*/#define PR_NEXT_LINK(_e) \ ((_e)->next)/*** Return the element preceding element "_e"*/#define PR_PREV_LINK(_e) \ ((_e)->prev)/*** Append an element "_e" to the end of the list "_l"*/#define PR_APPEND_LINK(_e,_l) PR_INSERT_BEFORE(_e,_l)/*** Insert an element "_e" at the head of the list "_l"*/#define PR_INSERT_LINK(_e,_l) PR_INSERT_AFTER(_e,_l)/* Return the head/tail of the list */#define PR_LIST_HEAD(_l) (_l)->next#define PR_LIST_TAIL(_l) (_l)->prev/*** Remove the element "_e" from it's circular list.*/#define PR_REMOVE_LINK(_e) \ PR_BEGIN_MACRO \ (_e)->prev->next = (_e)->next; \ (_e)->next->prev = (_e)->prev; \ PR_END_MACRO/*** Remove the element "_e" from it's circular list. Also initializes the** linkage.*/#define PR_REMOVE_AND_INIT_LINK(_e) \ PR_BEGIN_MACRO \ (_e)->prev->next = (_e)->next; \ (_e)->next->prev = (_e)->prev; \ (_e)->next = (_e); \ (_e)->prev = (_e); \ PR_END_MACRO/*** Return non-zero if the given circular list "_l" is empty, zero if the** circular list is not empty*/#define PR_CLIST_IS_EMPTY(_l) \ ((_l)->next == (_l))/*** Initialize a circular list*/#define PR_INIT_CLIST(_l) \ PR_BEGIN_MACRO \ (_l)->next = (_l); \ (_l)->prev = (_l); \ PR_END_MACRO#define PR_INIT_STATIC_CLIST(_l) \ {(_l), (_l)}#endif /* prclist_h___ */